The Apogee Element Series, Quartet, and Thunderbridge require a regulated power supply with the following specifications:
- Input: AC 100~240V, 50-60Hz (same unit can be used in U.S., Europe, and Asia)
- Output: DC 12V, 2.5Amps (2500mA), 30Watts
- Barrel Size: 2.1mm inside diameter x 5.5mm outside diameter
- Center Pin: Positive
NOTE: If the Apogee unit indicates it can accept a range of voltage, here’s how you calculate this using Quartet as an example:
The Quartet is capable of accepting a power supply with an output range of 9 – 16 Volts. However the Amperage must be enough to equal 30 Watts. Using Ohms Law (Watts / Volts = Amps), a power supply that outputs 9 Volts must also provide 3.33 Amps. Likewise, a power supply that outputs 16 Volts must also provide 1.875 Amps.